Square battery cell module heat exchange device and square battery cell module

Abstract

The utility model discloses a square battery cell module heat exchange device and a square battery cell module. The square battery cell module heat exchange device comprises at least one heat exchange tube unit used for conducting heat exchange on one battery cell of a battery cell module, each heat exchange tube unit is formed by connecting heat exchange tubes of a flat structure with the rectangular cross section, and a heat exchange medium circulation channel is formed in each heat exchange tube unit. The two U-shaped heat exchange tubes are oppositely arranged in a spaced mode, connected in parallel and used for heat exchange of the side faces of the battery cells, and the two linear heat exchange tubes are connected with the U-shaped heat exchange tubes, internally communicated, arranged in a spaced mode in the width direction and used for heat exchange of the bottom faces of the battery cells. According to the utility model, the heat exchange pipes with U-shaped structures are connected in parallel on the side surfaces of the single battery cells for heat exchange and the bottom surfaces of the battery cells, and the heat exchange pipelines are arranged on the paths with the highest heat exchange efficiency, namely the centers of the side surfaces and the bottom surfaces of the battery cells, so that heat in the battery cells can be quickly led out; and effective heat exchange can be carried out on the side surface and the bottom surface of each battery cell in the square battery cell module.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core heat exchange, in particular to a square battery core module heat exchange device and a square battery core module. Background Art

[0002] With the rapid development of new energy electric vehicles, the requirements for improving the safety and performance of battery packs have become more urgent. As one of the core components of the battery management system, thermal management can enable the battery to work within a suitable temperature range and ensure the consistency of the battery cells to reduce the barrel effect of the battery cell module; thermal management technology is of great significance in improving energy utilization, improving battery reliability, and increasing service life. The current mainstream thermal management includes air cooling, liquid cooling, direct cooling, etc., among which liquid cooling has better comprehensive performance.

[0003] In thermal management research, a single battery cell is often just regarded as a uniform heat source as a whole, however, this is not the case in reality. Especially for square batteries, the thermal conductivity in the normal direction of the side is much higher than that in the normal direction of the large surface. This is because inside the square battery cell, the pole pieces and diaphragms are stacked layer by layer in the normal direction of the large surface, and the thermal conductivity of the pole pieces is much greater than that of the diaphragms. When heat is transferred in the normal direction of the large surface, it needs to pass through the entire large surface of the diaphragm, and the thermal resistance is large. A large amount of heat forms a sandwich in the middle of the battery cell; when it is transferred in the normal direction of the side, the heat can be transmitted along the pole pieces, and the thermal resistance is small. This can also be verified from a large number of simulation and test results.

[0004] The prior art does not fully utilize the path with the highest heat transfer efficiency of the battery cell, and does not fully consider the significant anisotropy of the thermal conductivity of the square battery cell. The path with the highest heat transfer efficiency of the battery cell is the side and bottom surface. If the large surface of the battery cell is used as an important heat exchange surface, the thermal resistance is high, and it is difficult to effectively improve the unevenness of the overall temperature distribution of the module battery cell. As mentioned above, the temperature distribution of the battery cell in the module presents the characteristics of high center and low ends. The method of fluid entering or flowing out from the end mentioned in the prior art is not suitable for the temperature distribution of the module battery cell. As a result, during the liquid cooling process, the temperature of the fluid increases monotonically, reducing the heat dissipation effect on the battery cell in the center of the module; during the liquid heating process, the temperature of the fluid tends to decrease monotonically, which will reduce the heating effect on the battery cell at the fluid outlet end or heat the battery cell in the center of the module too quickly. In addition, the low flow rate of the heat exchange surface in the prior art leads to low heat exchange efficiency. In the prior art, the heat exchange structure between the battery cells in the module is often connected in parallel, the fluid flow rate flowing through the heat exchange surface of the battery cell is low, and the heat exchange coefficient is correspondingly reduced, thereby affecting the overall heat exchange effect. For example, the square cell heat dissipation structure in patents CN 205621819U and CN115692928 A uses the large surface of the cell as an important heat exchange surface. Although patent CN 217848077 U uses three-sided liquid cooling, it still has many shortcomings: for example, the patented technology enters the liquid from the end of the module, and the coolant first enters the end cell with lower cooling requirements, and then the coolant is continuously heated by the cell. When it reaches the middle of the cell with the highest temperature, the coolant temperature increases and the pressure decreases, reducing the heat exchange efficiency; the fluid channels on the heat exchange surface of the cell are parallel, and the side walls are harmonica tube structures. The increased flow resistance of the coolant leads to low flow velocity on the side walls, which in turn leads to a decrease in the heat exchange efficiency of the side walls. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and defects of the prior art and, based on the temperature distribution of square battery cells, to provide a square battery cell module heat exchange device with a relatively simple structure and strong applicability, and a square battery cell module that uses the square battery cell module heat exchange device for heat exchange.

[0006] One aspect of the utility model provides a square battery cell module heat exchange device, comprising at least one heat exchange tube unit for exchanging heat for one battery cell of the battery cell module, wherein the heat exchange tube unit is formed by connecting flat heat exchange tubes with rectangular cross-sections, and a flow channel for heat exchange medium is formed inside, including two U-shaped heat exchange tubes for heat exchange on the side surfaces of the battery cells, which are arranged relatively separately and connected in parallel, and two linear heat exchange tubes for heat exchange on the bottom surfaces of the battery cells, which are connected to the U-shaped heat exchange tubes and are internally connected, and are arranged separately along the width direction.

[0007] Among them, in one of the heat exchange tube units, one of the linear heat exchange tubes is used for the inlet of heat exchange medium, and the other linear heat exchange tube is used for the outlet of heat exchange medium.

[0008] There are two or more heat exchange tube units, and the linear heat exchange tubes between adjacent heat exchange tube units are connected and communicated through connecting pipelines to form a series structure.

[0009] Wherein, the connecting pipeline is located on the side wall in the length direction close to the end of the linear heat exchange tube.

[0010] There are two or more heat exchange tube units, and the linear heat exchange tube of one of the two outer heat exchange tube units is connected to the liquid inlet of the heat exchange medium, and the linear heat exchange tube of the other outer heat exchange tube unit is connected to the liquid outlet of the heat exchange medium.

[0011] Among them, further, it includes a heat exchange plate for wrapping the side and bottom of the battery cell, including two side heat exchange plates and a bottom heat exchange plate, the two U-shaped heat exchange tubes are respectively arranged on the surface of one of the side heat exchange plates, and the two linear heat exchange tubes are arranged on the surface of one of the bottom heat exchange plates.

[0012] Wherein, the surface of the heat exchange plate has a matching heat exchange tube embedding groove, and the U-shaped heat exchange tube and the linear heat exchange embedded are arranged in the heat exchange tube embedding groove.

[0013] The heat exchange plate and the heat exchange tube unit are in contact with the side and bottom surfaces of the battery core through heat conductive glue to exchange heat.

[0014] Wherein, the heat exchange plate is a metal plate.

[0015] Another aspect of the present invention provides a square battery core module, including the square battery core module heat exchange device of the present invention.

[0016] The square battery cell module heat exchange device of the utility model can use U-shaped heat exchange tubes in parallel to exchange heat on the side of the single battery cell and on the bottom of the battery cell for a single battery cell in the module. The heat exchange tubes are arranged on the path with the highest heat exchange efficiency (i.e., the side and bottom center of the battery cell), which can quickly export the heat inside the battery cell and effectively exchange heat on the side and bottom of each battery cell in the square battery cell module.

[0017] The square battery cell module heat exchange device of the utility model, after being used in a square battery cell module, for the battery cells on each side of the module, the heat exchange tube units of multiple battery cells form a series structure, which can reduce fluid flow loss, so that the heat exchange pipeline can always have a large flow, and ensure heat exchange efficiency; the multi-stage heat exchange structure formed after series connection can ensure good heat exchange efficiency, improve the uniformity of battery cell temperature distribution, and thereby improve the reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a perspective view of the heat exchange tube group structure of the utility model;

[0019] Figure 2 This is a front view of the heat exchange tube group structure of the utility model;

[0020] Figure 3 This is a left view of the heat exchange tube group structure of the utility model;

[0021] Figure 4 This is a top view of the heat exchange tube group structure of the utility model;

[0022] Figure 5 A perspective view of a heat exchange structure formed by a heat exchange tube group and a heat exchange plate of the utility model;

[0023] Figure 6 It is a flow velocity direction diagram of the fluid in the heat exchange structure formed by the heat exchange tube group and the heat exchange plate of the utility model;

[0024] Figure 7 This is a simulation result diagram of the temperature distribution contour of the battery module when the liquid cooling is turned on in the utility model;

[0025] Figure 8 This is a simulation result diagram of the temperature distribution contour of the battery module when the liquid cooling is turned off in the utility model;

[0026] Fig. 9 This is a comparison chart of the simulation results of the center temperature change of the liquid-cooled opening and closing module of the utility model.

[0027] Description of reference numerals:

[0028] The middle liquid inlet / outlet 11 of the left heat exchange tube group unit, the middle liquid inlet / outlet 12 of the right heat exchange tube group unit, the outer liquid outlet 21 of the left heat exchange tube group unit, the outer liquid outlet 22 of the right heat exchange tube group unit, the left heat exchange tube group unit 31, the right heat exchange tube group unit 32, the U-shaped heat exchange tube 33, the linear heat exchange tube 34, the left heat exchange tube group unit connecting tube 41, the right heat exchange tube group unit connecting tube 42, the side heat exchange plate 51, and the bottom heat exchange plate 52. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] like Figures 1 to 6As shown, the square battery cell module heat exchange device of the utility model embodiment includes at least one heat exchange tube unit for exchanging heat for one battery cell of the battery cell module, and the heat exchange tube unit is formed by connecting flat heat exchange tubes with rectangular cross-sections, and a flow channel for heat exchange medium is formed inside, including two U-shaped heat exchange tubes 33 for heat exchange on the side of the battery cell, which are arranged relatively separately and connected in parallel, and two linear heat exchange tubes 34 for heat exchange on the bottom of the battery cell, which are connected to the U-shaped heat exchange tubes and internally communicated, and are arranged separately along the width direction.

[0031] Optionally, each U-shaped heat exchange tube 33 is located in the middle of the side of the battery cell, and two linear heat exchange tubes 34 are parallel to each other, and two are grouped together and located in the middle of the bottom surface of the battery cell. A single battery cell is formed of two parallel heat exchange paths by two U-shaped heat exchange tubes. When used for heat exchange of square battery cell modules, multiple heat exchange tube units are combined and connected together, such as Figure 1 As shown, a series connection structure is formed to achieve heat exchange of the battery cell module.

[0032] In the present application, the heat exchange unit can be used to cool the battery core, such as passing a cooling medium for heat exchange to reduce the surface temperature of the battery core, and can also be used to heat the battery core, such as passing a heating medium for heat exchange to increase the temperature of the battery core. Among them, in one of the heat exchange tube units, one of the linear heat exchange tubes is used for the inlet of the heat exchange medium (refrigerant or heat medium), and the other linear heat exchange tube is used for the outlet of the heat exchange medium (refrigerant or heat medium).

[0033] In the present application, the square battery cell module heat exchange device, when used for square battery cell module heat exchange, can be at least two or more heat exchange tube units connected for use, such as connected in series, to achieve heat exchange of the battery cells of the square battery cell module. Preferably, one heat exchange tube unit corresponds to one battery cell of the square battery cell module, and can be selected and matched according to the number of battery cells of the square battery cell module. The heat exchange tube units of multiple battery cells form a series structure, which can reduce fluid flow loss, so that the heat exchange pipeline can always have a large flow rate, and ensure heat exchange efficiency; the multi-stage heat exchange structure formed after series connection can ensure good heat exchange efficiency, improve the uniformity of battery cell temperature distribution, and thus improve the reliability of the battery.

[0034] In the present application, there are two or more heat exchange tube units, and when multiple cells of a cell module are used for heat exchange, adjacent heat exchange tube units are connected in series so that the heat exchange medium flows in the pipes inside each heat exchange tube unit to achieve heat exchange. Preferably, the series connection method is to connect and communicate the linear heat exchange tubes of adjacent heat exchange tube units through connecting pipes to form a series structure. In an optional embodiment, the connecting pipe is located on the side wall in the length direction near the end of the linear heat exchange tube, and a hole is opened on the side wall in the length direction of the end of the linear heat exchange tube and connected to the connecting pipe, so that two adjacent linear heat exchange tubes are connected on the same side through the connecting pipe.

[0035] In the above-mentioned embodiment, when used in a square battery core module, there are two or more heat exchange tube units, wherein the linear heat exchange tube of one of the two heat exchange tube units located on the outside is connected to the liquid inlet of the heat exchange medium, and the linear heat exchange tube of the other heat exchange tube unit located on the outside is connected to the liquid outlet of the heat exchange medium, that is, the heat exchange tube units forming a series structure include a liquid inlet of the heat exchange medium and a liquid outlet of the heat exchange medium, which is convenient for the arrangement of the inlet and outlet.

[0036] The square cell module heat exchange device of the present application, when used for square cell module heat exchange, can be implemented by dividing the cells of the square cell module into two groups (or multiple groups, not limited to two groups), each group is configured with a heat exchange tube group unit formed by two or more heat exchange tube units connected in series, and the two heat exchange tube groups can be arranged in parallel, with separate liquid inlets and liquid outlets, which do not affect the heat exchange of the matching cells. Among them, when heating, liquid can be introduced from the heat exchange tube unit located on the outside of the cell module, and liquid can be discharged from the middle heat exchange tube unit, and when cooling, liquid can be discharged from the heat exchange tube unit located on the outside of the cell module, and liquid can be introduced from the middle heat exchange tube unit. In this way, for the square battery cell module as a whole, the liquid inlet and outlet paths can be flexibly adjusted according to the thermal management requirements. When cooling is needed, the liquid is introduced from the middle to cool the middle battery cell with a higher temperature first, and then the battery cells at both ends with relatively low cooling requirements are cooled; when heating, the liquid is introduced from both ends to heat the battery cells at both ends with lower temperatures first, and then the middle battery cell with higher temperature is heated. This has greater flexibility, improves the thermal management efficiency, and makes the battery cell temperature in the module more balanced.

[0037] The square battery cell module heat exchange device of the present application has one heat exchange tube unit including two U-shaped heat exchange tubes and two linear heat exchange tubes. Several heat exchange tube units can be selected to be connected in series to a heat exchange tube group unit according to the number of battery cells in the battery cell module and the heat exchange requirements, and the layout positions of the liquid inlet and the liquid outlet can be selected.

[0038] Preferably, in the present application, the cells inside the square cell module are evenly divided into two groups, and two parallel heat exchange tube group units are configured (such as Figure 1-Figure 5 The left heat exchange tube group unit 31 and the right heat exchange tube group unit 32 are shown, wherein the adjacent heat exchange tube units of the left heat exchange tube group unit 31 are connected in series through the left heat exchange tube group unit connecting pipe 41, and the adjacent heat exchange tube units of the right heat exchange tube group unit 32 are connected in series through the right heat exchange tube group unit connecting pipe 42) for heat exchange. The following takes the battery cells inside the square battery cell module as divided into two groups and uses two heat exchange tube group units as an example to illustrate its arrangement and structure.

[0039] When the number of battery cells is 4n+2 (n is an integer ≥0), the middle liquid inlet / outlet 11 of the left heat exchange tube group unit is located at the lower right end of the front side of the 2n+1th battery cell, the middle liquid inlet / outlet 12 of the right heat exchange tube group unit is located at the lower left end of the front side of the 2n+2th battery cell, the outer liquid inlet / outlet 21 of the left heat exchange tube group unit is located on the side of the rear side of the 1st battery cell, and the outer liquid inlet / outlet 22 of the right heat exchange tube group unit is located on the side of the rear side of the 4n+2th battery cell.

[0040] When the number of battery cells is 4n (n is an integer > 0), the middle liquid inlet / outlet 11 of the left heat exchange tube group unit is located at the lower right end of the front side of the 2nth battery cell, the middle liquid inlet / outlet 12 of the right heat exchange tube group unit is located at the lower left end of the front side of the 2n+1th battery cell, the outer liquid inlet / outlet 21 of the left heat exchange tube group unit is located on the side of the rear side of the 1st battery cell, and the outer liquid inlet / outlet 22 of the right heat exchange tube group unit is located on the side of the rear side of the 4nth battery cell.

[0041] When the number of battery cells is 4n+1 (n is an integer ≥0), the middle liquid inlet / outlet 11 of the left heat exchange tube group unit is located at the lower right end of the front side of the 2nth battery cell, the middle liquid inlet / outlet 12 of the right heat exchange tube group unit is located at the lower left end of the front side of the 2n+1th battery cell, the outer liquid inlet / outlet 21 of the left heat exchange tube group unit is located on the side of the front side of the 1st battery cell, and the outer liquid inlet / outlet 22 of the right heat exchange tube group unit is located on the side of the rear side of the 4n+1th battery cell.

[0042] When the number of battery cells is 4n+3 (n is an integer > 0), the middle liquid inlet / outlet 11 of the left heat exchange tube group unit is located at the lower right end of the front side of the 2n+2th battery cell, the middle liquid inlet / outlet 12 of the right heat exchange tube group unit is located at the lower left end of the front side of the 2n+3th battery cell, the outer liquid inlet / outlet 21 of the left heat exchange tube group unit is located on the side of the front side of the 1st battery cell, and the outer liquid inlet / outlet 22 of the right heat exchange tube group unit is located on the side of the rear side of the 4n+3th battery cell.

[0043] In the present application, the middle liquid inlet / outlet 11 of the left heat exchange tube group unit, the middle liquid inlet / outlet 12 of the right heat exchange tube group unit, the outer liquid outlet 21 of the left heat exchange tube group unit, and the outer liquid outlet 22 of the right heat exchange tube group unit can each be used as a liquid inlet during cooling or as a liquid outlet during heating. During use, the inlet and outlet positions are swapped according to thermal management requirements. For example, during the liquid cooling process, the middle liquid inlet / outlet 11 of the left heat exchange tube group unit and the middle liquid inlet / outlet 12 of the right heat exchange tube group unit are the liquid inlet pipelines, and the outer liquid outlet 21 of the left heat exchange tube group unit and the outer liquid outlet 22 of the right heat exchange tube group unit are the liquid outlet pipelines; during the liquid heating process, the outer liquid outlet 21 of the left heat exchange tube group unit and the outer liquid outlet 22 of the right heat exchange tube group unit are the liquid outlet pipelines, and the middle liquid inlet / outlet 11 of the left heat exchange tube group unit and the middle liquid inlet / outlet 12 of the right heat exchange tube group unit are the liquid outlet pipelines. Of course, if the square battery cell module has multiple vertical battery cell groups, an additional liquid separation device can be used to connect the inlet / liquid port for liquid inlet.

[0044] Among them, further, the heat exchange device of the present application also includes a heat exchange plate for wrapping the side and bottom of the battery cell, including two side heat exchange plates 51 and a bottom heat exchange plate 52, the two U-shaped heat exchange tubes are respectively arranged on the surface of one of the side heat exchange plates, and the two linear heat exchange tubes are arranged on the surface of one of the bottom heat exchange plates. Preferably, the surface of the heat exchange plate has a matching heat exchange tube embedding groove, and the U-shaped heat exchange tube and the linear heat exchange embedded are arranged in the heat exchange tube embedding groove.

[0045] In order to achieve better heat exchange effect, the heat exchange plate and heat exchange tube unit are in contact with the side and bottom of the battery cell through heat conductive glue (preferably with a thickness of 0.3mm-1mm) for heat exchange. Preferably, the heat exchange plate is made of metal plate, such as copper plate, with a thickness of 0.5mm-3mm. For the battery cell module, the large surfaces of adjacent battery cells are separated by heat conductive silicone with a thickness of 0.3mm-1mm. The heat conductive silicone can ensure sufficient contact between the heat conductors, increase the effective heat exchange area, and thus improve the heat exchange effect.

[0046] In the above embodiments, flat tubes are selected as heat exchange pipes, and the heat exchange pipes are embedded in the surface of the heat exchange plate formed by the metal plate, so that the heat exchange area can be increased. Thermal conductive silica gel is padded between the heat exchange plate and the battery cell to discharge the insulating air and eliminate other obstacles in the heat transfer process.

[0047] In addition, the entire heat exchange structure is compactly designed, the heat exchange wall is thin, and the heat exchange pipes and heat exchange plates on the bottom can also support the battery cells, improving the module space utilization rate; the pipeline route is relatively simple, the manufacturing and processing cost is low, and it has good applicability.

[0048] Another aspect of the utility model provides a square battery cell module, including a square battery cell module heat exchange device of the utility model, wherein large surfaces of adjacent battery cells are connected by thermally conductive silicone for heat conduction or heat exchange, and each battery cell cooperates with one of the heat exchange tube units for heat exchange.

[0049] Below, a simulation experiment is described using 6 battery cells as an example. The 6 battery cells are placed in a heat exchange device formed by heat exchange plates and heat exchange tubes that matches the 6 battery cells and has two heat exchange tube group units. The two heat exchange tube group units are connected in parallel, and the heat exchange tube groups in each heat exchange tube group unit are connected in series. Taking cooling as an example, the coolant flows in from the middle inlet / outlet 11 of the left heat exchange tube group unit on the lower right side of the 3rd battery cell and the middle inlet / outlet 12 of the right heat exchange tube group unit on the lower left side of the 4th battery cell, and flows out from the outer liquid outlet 21 of the left heat exchange tube group unit on the rear side of the 1st battery cell and the outer liquid outlet 22 of the right heat exchange tube group unit on the rear side of the 6th battery cell. The entire heat exchange system is symmetrical along the large surface adjacent to the 3rd battery cell and the 4th battery cell. Figure 8 The arrows show the flow velocity directions on each heat exchange tube of the heat exchange structure of the 4th, 5th, and 6th cells. The situation on the 1st, 2nd, and 3rd cells is similar to Figure 8 The flow velocity directions on the heat exchange tubes shown in FIG. 5 are symmetrical.

[0050] The simulation results of the embodiment of the six cells are as follows: Figure 7 , 8 , as shown in 9, Figure 7 It shows that when the liquid cooling system is turned on, the temperature distribution is more uniform; Figure 8 It shows that when the liquid cooling system is turned off, a lot of heat is concentrated in the middle area of ​​the module; Fig. 9 The simulation results of the temperature change of the module center when the liquid cooling is turned on and off are compared. When the heat exchange system is turned on, the temperature of the module center reaches equilibrium at about 1500s, and the temperature rise is only about 5 degrees Celsius; when the heat exchange system is turned off, the temperature of the module center continues to rise, about 13 degrees Celsius at 1500s, and about 29 degrees at 3600s. It can be seen that the heat exchange system has a good heat exchange effect.

[0051] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A square battery module heat exchange device, characterized in that: The invention comprises at least one heat exchange tube unit for exchanging heat for one battery cell of the battery cell module, wherein the heat exchange tube unit is formed by connecting flat heat exchange tubes with rectangular cross-sections, and a flow channel for heat exchange medium is formed inside, and the heat exchange tube unit comprises two U-shaped heat exchange tubes for heat exchange on the sides of the battery cells which are arranged relatively apart and connected in parallel, and two linear heat exchange tubes for heat exchange on the bottom surfaces of the battery cells which are connected to the U-shaped heat exchange tubes and communicated with the inside and are arranged apart along the width direction.

2. The square battery module heat exchange device according to claim 1, characterized in that: In one of the heat exchange tube units, one of the linear heat exchange tubes is used for the inlet of heat exchange medium, and the other linear heat exchange tube is used for the outlet of heat exchange medium.

3. The square battery module heat exchange device according to claim 2, characterized in that: There are two or more heat exchange tube units, and the linear heat exchange tubes between adjacent heat exchange tube units are connected and communicated through connecting pipelines to form a series structure.

4. The square battery module heat exchange device according to claim 3, characterized in that: The connecting pipeline is located on a side wall in the length direction close to the end of the linear heat exchange tube.

5. The square battery module heat exchange device according to claim 3, characterized in that: There are two or more heat exchange tube units, and the linear heat exchange tube of one of the two outer heat exchange tube units is connected to the liquid inlet of the heat exchange medium, and the linear heat exchange tube of the other outer heat exchange tube unit is connected to the liquid outlet of the heat exchange medium.

6. The square battery module heat exchange device according to claim 1, characterized in that: It includes heat exchange plates for wrapping the sides and bottom of the battery core, including two side heat exchange plates and a bottom heat exchange plate, the two U-shaped heat exchange tubes are respectively arranged on the surface of one of the side heat exchange plates, and the two linear heat exchange tubes are arranged on the surface of one of the bottom heat exchange plates.

7. The square battery module heat exchange device according to claim 6, characterized in that: The surface of the heat exchange plate is provided with a matching heat exchange tube embedding groove, and the U-shaped heat exchange tube and the linear heat exchange embedded are arranged in the heat exchange tube embedding groove.

8. The square battery module heat exchange device according to claim 7, characterized in that: The heat exchange plate and the heat exchange tube unit are in contact with the side surface and the bottom surface of the battery core through the heat conductive glue to exchange heat.

9. The square battery module heat exchange device according to claim 6, characterized in that: The heat exchange plate is a metal plate.

10. A square battery cell module, characterized in that: It comprises the square battery core module heat exchange device as described in any one of claims 1-9.

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